. >> reporter: in 1980, between ronald reagan and jimmy carter. and lloyd benson's wipe at dan quail in 1988. >> i served with jack kennedy, i knew jack kennedy, jack kennedy was a friend of mine, senator, you're not jack kennedy. >> reporter: then there were the moments that seemed to say momplt and george h.w. bush looking at his wash. governor rick perry's oops remark. romney's high dollar wager. >> a $10 bet? >> and obama's comment about hillary clinton. one thing analyst's agree on. >> he's got two very tough competing goals, be likable and may out a contrast. >> we have gotten to know barack obama pretty well, we have seen anymore as president for four years. mitt romney, he has still got a little white space on his canvass, he can still show us who he is and where he would lead us. >> reporter: the president spends the first part of the week in the battleground state of nevada where he'll be practicing with john kerry, and president obama will be practicing with rob port man who is playing president balm. >>> president obama and milt romney